Acoustic feedback learning aid



FIG. 1 is a front perspective view of the acoustic feedback learning aid design;

FIG. 2 is a front plan view of the acoustic feedback learning aid design;

FIG. 3 is rear plan view of the acoustic feedback learning aid design;

FIG. 4 is a side elevation view of the acoustic feedback learning aid design, with the opposite side being symmetrical thereto;

FIG. 5 is top plan view of the acoustic feedback learning aid design; and,

FIG. 6 is a bottom plan view of the acoustic feedback learning aid design.

The broken line disclosures shown in the Figures of the acoustic feedback learning aid design are for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for acoustic feedback learning aid, as shown and described. 